Portable spa



FIG. 1 is a front left side perspective view of a portable spa accordingto a first embodiment;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevation view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a left side perspective view of a portable spa according to asecond embodiment;

FIG. 8 is a top plan view thereof;

FIG. 9 is a side elevation view thereof;

FIG. 10 is a rear left side perspective view of a portable spa accordingto a third embodiment;

FIG. 11 is a top plan view thereof; and,

FIG. 12 is a side elevation view thereof.

The broken lines shown represent unclaimed subject matter and form nopart of the claimed design.

The ornamental design for a portable spa, as shown and described.